Supplements do both. They help your brain heal. They do not cause your brain to heal. But since the brain is damaged, it has a greater need for a higher level of nutrition. Plus, the injured brain is more sensitive to stress so taking supplements to reduce that sensitivity is worthwhile.

What do you have against taking supplements ?

How about this example? Not exact. Just to demonstrate an idea.

Your injured brain is working at a 5 out of 10.

Taking supplements helps it recover to a 9 out of 10.

Discontinuing supplements and your brain works at 8 out of 10.

A brain on supplements during stress drops to an 8 out of 10 from 9 out of 10, a 1 point drop.

A supplement free brain during stress drops to a 6 out of 10 from 8 out of 10, a 2 point drop.

So, do you want to have a brain that works at its optimum or at a level less than optimum ?